// 设置响应头中间件
module.exports = async (ctx, next) => {
  const contentType = 'application/json; charset=utf-8'
  ctx.set('Content-Type', contentType)
  ctx.response.body = '{"success": true}'
  ctx.set("Access-Control-Allow-Origin","*")
  ctx.set("Access-Control-Allow-Methods","OPTIONS,GET,PUT,POST,DELETE")
  await next()
}